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UPDATE: The JEA employee injured in the accident was identified as John Jenquine, a 7-year employee with the company. As of Saturday afternoon, Jenquine was still in critical, but stable condition.

JACKSONVILLE, Fla. -- Two men were seriously injured in a downtown building during an electrical explosion Friday afternoon.

One of the men involved is in serious condition, the other man was air-lifted to UF Health Gainesville in life-threatening condition.

The two men were investigating an electrical issue at 550 Water Street around 3 p.m. when there was an 'arc flash' and the men were burned, according to JEA spokesperson Gerri Boyce.

According to OSHA, an arc flash is a phenomenon where a flashover of electric current leaves its intended path and travels through the air from one conductor to another, or to ground.

One of the men is a JEA employee and one of the men works for the management company that owns the building, BP Graham LLC. Boyce said she only knew the men's ages, 38 and 48, and did release their identities or who had what injury.

CSX has office space at 550 Water Street and employees evacuated from the building after the accident.

The flash happened at a small building near the CSX and 550 buildings where electrical equipment is housed.

JEA is investigating along with the Jacksonville Sheriff's Office to determine the cause.

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